Nipple



FIG. 1 is a top plan view of a nipple, showing my new design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a right side elevational view thereof, the left sideelevational view being identical;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a bottom plan view thereof; and

FIG. 6 is a front elevational view thereof.

The ornamental design for a nipple, as shown and described.